%0 Journal Article
%A V. N. Gol'dberg
%T The occurrence of discontinuities when extending solutions of nonlinear mixed problems for hyperbolic equations on the plane
%J Doklady Akademii Nauk
%D 1968
%P 1257-1260
%V 182
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1968_182_6_a3/
%G ru
%F DAN_1968_182_6_a3